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## 1. Basic Concepts
### 1.1. Invisible Allies
Invisible Allies (IAs) are monsters you can tame to help you fight in BA. There’s 500 Invisible Allies to tame, one for each BA enemy.
Each IA has up to 2 passive abilities, which work pretty much like equipment bonuses, and up to 3 active abilities, that work similarly to active skills.
Active abilities are based on your stats, for example every damage ability uses your min and max damage, weaken uses your weaken effect, and so on. They ignore enemy evasion. In case of status effects, they always hit.
To catch an IA you need to fight the rare or epic version of the monster, and there’s a chance it will drop the IA item. The item is a transparent scroll and is really difficult to see, so you’ll most likely pick it up without noticing.
![](http://i38.photobucket.com/albums/e124/Draconi/Kongregate/IAScroll.png)
_Scroll on a white background_
![](http://i38.photobucket.com/albums/e124/Draconi/Kongregate/IAScroll2.png)
_Scroll on a BA zone_
The IA loot has 30% chance to move towards you, and there’s 100% chance of it getting attracted if you have loot magnet active. After taming the IA, the corresponding enemy stops dropping its IA item.
The chance of the IA dropping depends on the area you’re on and on your drop rate, and some enemies have their own chance or conditions to drop their IA. The chance for an IA to drop is:
FinalIAChance = IAChance \* FinalDropRate / 10
Where “IAChance” is the base value from area or from the enemy.
Upon catching an IA, it can be equipped in the “Invisible Ally” screen. There you can also see its exp bar, its bestiary entry, and also the info screen containing its base (casual) level, total exp and abilities. You can also mark an IA (star button) to spot it easily while scrolling.
### 1.2. Drop Rate
Drop rate helps increase the IA drop chance further. Total drop rate is:
FinalDropRate = BaseDR \* RarityMult \* EnemyRankMult \* BestiaryMult \* EvolvingMult \* EnemyMult
Base drop rate (BaseDR) consists of everything that changes the number displayed in the Stat screen. They are Drop Rate bonus, Five-Leaf Clover skill, IA’s Drop Rate passive ability, luck ring, reward buff, nightmare buff, Item Maker career, double drop rate temporary ascension perk, Worst Moon mode and loot day. They stack with each other as follows:
BaseDR = (DRBonus + SkillDR + IADR + LuckRing + BuffDR + ItemMakerDR) \* PerkDR \* WMDR \* LootDay
Loot day is an event that happens twice a month (except on February, as one of the loot days is scheduled to happen on February 30th). During loot day your drop rate is doubled. You can find when loot day happens [here](http://www.kongregate.com/forums/60/topics/218223).
If an enemy is rare, it will have 10x drop rate multiplier (RarityMult = 10). Epic enemies have 20x drop rate multiplier (RarityMult = 20).
You get your drop rate multiplied by EnemyRankMult = (0.25 + 0.25 \* EnemyRank + EnemyLevel / 9001), where EnemyRank is 1 to 4 for yellow, white, red and bosses.
Bestiary levels 4, 5 and 6 also increase your drop rate, by 1.15x, 1.30x and 1.5x respectively (BestiaryMult).
Evolving enemies (enemies that spawn an enemy when they’re killed) have 0.1x drop rate multiplier (EvolvingMult).
Additionally the following enemies have a drop rate multiplier (EnemyMult):
- Corrupted Giant Treeman: 9x
- CHAOS: 9x
- Chaos: 6x
- Chuck Norris: 6x
- Boss of DOOOOOOM: 6x
- THE MEGABOSS: 3x
- Secret Crystal (1): 3x
- Secret Crystal (2): 30x
Dark Pyramid, Spooky Crypt and Triangle Hideout have 0% drop rate. Their IAs drop as though you had 100% DR.
### 1.3. Rare Rate
Rare rate increases the chance of encountering rare enemies. You can get rare rate from equipment bonuses, Five-Leaf-Clover skill and luck ring. As of v1500, rare rate and drop rate equip bonuses increase the chances by the same amount, so when hunting IAs you’ll get the best results if you have rare and drop rate values as close as possible.
Epic rate also helps for hunting IAs, but since the values for epic chance for the different areas are considerably low, rare chance is likely a better choice, unless when rare chance is already maxed.

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### 4. Invisible Ally Training
To get exp for your IA you must equip it and fight enemies with the same level or higher than your IA. You get exp for each kill as follows:
- 1 exp if enemy is at least the same level
- 2 exp if enemy is the same as your IA
- 10 exp if enemy is the same and rare
- 30 exp if the enemy is the same and epic
Before reaching 10000 exp the IA will receive an exp bonus equal to (AllyExp / 1000)% for its corresponding BA monster.
Upon reaching 10000 exp the IA becomes mastered. Mastered IAs have their corresponding BA monster give extra 20% exp. Non-evolving monsters have and additional chance to spawn as rare (5%) or epic (0.5%, WM mode only), which can be also increased by rare/epic rate. Rare and epic monsters have improved reward. It might be a good idea to master the IAs from the areas you fight the most in first.
Note that the increase in rare and epic chance from mastering an IA doesn’t add directly to the area chance. If an area has x% rare chance and you master an IA, it will have (5 + 0.95 x)% chance to spawn that enemy’s rare version (with 100% rare rate).
To master your IAs, the best thing is to fight in an area where the weakest enemy has a higher level than your IA. The following are some good fast spawn areas to fight in when idling:
- Secret Beach (820, 1066 HC)
- Smiley Island (4000, 5200 HC)
- Not Copyright Infringement (4700, 6110 HC)
- Pirate Ship Interior (1600, 2080 HC, with Dark Ruler weapon)
The following are fast/instant spawn areas to fight in when you’re anti-idling:
- Dark Pyramid (66, 85 HC)
- Pirate Ship Interior (1600, 2080 HC)
- Spooky Crypt (7000, 9001 HC)
Note: Spooky Crypt has a checkpoint system every 200 kills. That means that you should leave and reenter before a checkpoint to keep the enemy difficulty as low as possible, so that you kill the enemies faster. Also 0 kill HC might be easier than 2000 kills on casual.

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### 6. Ability Lists
I’d like to thank crazye97 for providing these lists. You can use these lists to find which enemies have the abilities you need and how strong they are.
[Passive Ability List](http://home.cc.umanitoba.ca/~umpen382/Anti-Idle/Invisible_Allies_Passive.html)
[Active Ability List](http://home.cc.umanitoba.ca/~umpen382/Anti-Idle/Invisible_Allies_Active.html)

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### 8. Outdated Information
This guide was last fully updated on December 23rd 2012 (v1523). It was up to date at least until January 12th 2013 (v1535). It was updated with partial information on May 20th 2013. The following things are missing:
- Drop rate multiplier changes (I know SC1 and 2 changed to something that depends on Crystal level now)
- Changes I didn’t notice since January 2013.
- Anything that changed since April 10th 2013.
This topic is not being updated anymore.

I don’t know if it’s of any help (or interest), but I still have my [sortable passive abilities list](http://home.cc.umanitoba.ca/~umpen382/Anti-Idle/Invisible_Allies_Passive.html), which I’m looking at expanding to more detail.

> *Originally posted by **[crazye97](/forums/60/topics/306643?page=1#posts-6493228):***
>
> I don’t know if it’s of any help (or interest), but I still have my [sortable passive abilities list](http://home.cc.umanitoba.ca/~umpen382/Anti-Idle/Invisible_Allies_Passive.html), which I’m looking at expanding to more detail.
I was going to link to it but last time I checked it was not updated yet.
> *Originally posted by **[notatriangle](/forums/60/topics/306643?page=1#posts-6493697):***
>
> This… just wow. All of that effort. Did you do all of this by hand? Because the entry for “Elite Mummy” is missing a “%” sign.
I made a script to gather all the data and format it, but I didn’t work that much on the script so in the end I had to finish the job myself. Stuff like removing “%” from passive skills that aren’t percentage, adding Y abilities to attack abilities (poison, blind, etc), removing “damage” and adding “s” after buffs, and other stuff. Elite Mummy one happened while updating to v1500, which was also by hand.
~~How the hell did you spot that BTW \>\_\>~~